1. Department of Biology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
2. Departments of Pediatrics and Microbiology & Immunology, Stanford University School of Medicine, Stanford, California
3. Cellular Microbiology and Bioinformatics Unit, Novartis Vaccines, 53100 Siena, Italy
4. Department of Biomolecular Engineering, University of California, Santa Cruz, Santa Cruz, California
5. Department of Microbiology and Immunology, Uniformed Services University, Bethesda, Maryland
6. Department of Microbiology and Environmental Toxicology, University of California, Santa Cruz, Santa Cruz, California
7. Department of Medical Microbiology and Immunology, University of Alberta, Edmonton, Alberta, Canada
8. Division of Human Biology, Fred Hutchinson Cancer Research Center, Seattle, Washington 98109
9. Institute of Molecular Biology, University of Oregon, Eugene, Oregon 97403